340 bicycles, 65 feet high.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

A man-made island in scenic San Francisco Bay.

California's own majestic geyser is powered by a subterranean volcano.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

Discover for yourself what Herb Caen referred to as "the best kept secret in the Bay Area."

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

A house built from trash known as the poor man's Hearst Castle.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

An extensive collection of ancient Egyptian artifacts and mummies.

The unbelievably opulent home built for an infamous newspaperman.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

San Francisco Bay's ghost town.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

Tiki luxury on Nob Hill.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

San Francisco's newly reopened hands-on science museum.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A huge musical instrument played by the ocean.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.